Please anybody suggest how you can fix this problem in joomla website

Fatal error: Permitted memory size 67108864 bytes exhausted (attempted to allocate 41 bytes) in /home/content/46/8440746/html/libraries/joomla/error/exception.php online 117

You have to increase memory limit of PHP

Produce a file using the title php.ini

set the worthiness like memory_limit = 80M same the file and set this php.ini file
in to the administrator folder, Structure like:

joomla/administrator/php.ini

within the above structure the file php.ini is yours

Edit: the memory_limit you'll change based on you
the above mentioned limit is simply a good example